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  1. G

    Using Amsoil in 2005 Porsche Boxster S?

    Thanks Doug What do your believe the benefits of using this oil with higher 4 vis levels are? are there any downsides to using this oil? Also, I noticed that Delvac 5w-40 seems to be for heavy duty diesel trucks? And you put it in your porsche? I noticed the last post from what seems to be an...
  2. G

    Using Amsoil in 2005 Porsche Boxster S?

    Thanks all for your replies and suggestions. I can't recall if Mobil 1 0w40 is the 'standard' option for the boxster? Doug, you are using Mobil 1 5w-40? Why would you not suggest I use the same oil?
  3. G

    Using Amsoil in 2005 Porsche Boxster S?

    I have been reading up on engine oils and have read so many VERY positive thing sbout AMSOIL motor oil. My car is no longer covered by Porsche warranty and I plan to keep the car long term (100K+ miles) and want to ensure that the engine oil I am using is the very best that I can put in the car...
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